delphijustin
Banned
In this thread I am going to talk about build a status indicator for the telephone line. It will do is tell you if someone's on the phone, off the phone, incoming calls, and if the phone line is working. Why whould you want this device? Well, lets say you have 2 phones in your house and you want to know if someone is using one, or if you need to test the phone line to see if its working.
What you will need is.
1 Rectifier diode (It should not matter which kind you use)
1 12 Volt LED
2 33KΩ Resistors
1 telephone cord
Something to cut-and-slice the telephone cord.
Optional components
1 180KΩ Resistor (This makes a better dim, you can ignore it if you want to)
Those parts you can find at AllElectronics.com
Here is the blueprints
**broken link removed**
Contact me by email delphijustin@mail.com , if there is any problems,
NOTE: Phone cords may have different color-coded wires.
What you will need is.
1 Rectifier diode (It should not matter which kind you use)
1 12 Volt LED
2 33KΩ Resistors
1 telephone cord
Something to cut-and-slice the telephone cord.
Optional components
1 180KΩ Resistor (This makes a better dim, you can ignore it if you want to)
Those parts you can find at AllElectronics.com
Here is the blueprints
**broken link removed**
Contact me by email delphijustin@mail.com , if there is any problems,
NOTE: Phone cords may have different color-coded wires.
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